Crushing and grinding mill



(No Model.) 7

G. S. KNAPP. GRUSHING'AND GRINDING MILL.

Patented Apr. 5, 1892.

FIG 2.

IN Ge VEN TORI aJInap v,

ATTEsT:

UNITED STATES PATENT OFFICE.

GEORGE S. KNAPP, OF CHICAGO, ILLINOIS.

CRUSHING AND GRINDING MILL.

SPECIFICATION forming part of Letters Patent No. 472,367, dated April 5,1892.

Application filed May 21, 1891. Serial No. 393,621. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE S. KNAPP, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Crushing and GrindingMills; and I do hereby declare the following to be a full, clear, andeXact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to that type of crushing and grinding mills forore, stone, and like materials, in which motions to and from each otherand up and down past each other are imparted to the pair of jaws byoperative eccentric shafts journaled to the said jaws.

The objects of the present invention are twofold: first, to provide animproved formation of the jaws and the use in connection therewith ofbearing-rollers for the lower ends of the jaws, whereby the opening orspace between the lower ends of the jaws is preserved of a uniform size,regardless of the relative positions of the jaws with relation to eachother or to a fixed part of the machine, and in consequence a reductionor crushing of the ore to a uniform degree of fineness will be effectedbefore passing out of the machine; second, to provide an improvedgearing connection between the operating eccentric shafts of the jaws,whereby a differential movement is imparted to the same, accompaniedwith a constant change in the opposing surfaces of the same, by whichmeans a greater durability is imparted to the wearing or grinding facesof the, jaws, due to a constant change in the surface thereof exposed tothe greatest wear. I attain such objects by the construction andarrangement of parts illustrated in the accompanying drawings, inwhich-- Figure 1 is a longitudinal vertical section of a crushing andgrinding mill constructed in accordance with my present invention; andFig. 2, a side elevation of the same, illustrating my improveddifferential gearing connection between the eccentric operating-shaftsof the mill.

Similar numerals of reference indicate like parts in both views.

Referring to the drawings, 1 represents the main stationary housing orframe of the mill,

having suitable boxes 2 for the bearings of.

the pair of eccentric driving-shafts 3, that impart motion to thecounterpart jaws 4 of the usual sectional construction, the eccentricshafts also turning in boxes 5 on the back of the jaws 4, as shown. Inthe present invention the lower portion 6 of the face of each jaw is ofa curved formation, and the lower portion 7 of the back of each jaw. isof a similar curved formation and constitutes a curved bearing-track forthe friction or hearing roller 8, a pair of which are employed to holdthe lower end of the jaws 4 4 in proper relative position.

The curved formation of the lower portion of the face and back of thejaws, as above described, imparts a uniform transverse thickness to thejaws ata horizontal line drawn between the axis of the rollers 8, atwhich point is the lower or discharge opening between the jaws,regardless of the vertical position of said jaws with relation to eachother or the oblique position of the jaws with relation to verticalparts of the machine. I thereby obtain a uniform size of the openingbetween the jaws under all conditions, and in consequence can attain auniform degree of fineness of the crushed product of the mill, thedegree of fineness being gaged by the adjustment of the rollers 8 to orfrom each other by means of adjusting-screws 9 and adjustable boxes 10,that support the end trunnions of said rollers.

Another part of the present improvementrelates to rotating the eccentricdriving-shafts 3 3 at different speeds relatively, so that the one shaftand its jaw will have a faster movement relatively than the other shaftand jaw, and by this means attain a constant change in the opposingsurfaces of the pair of jaws. This is best accomplished by means of apair of spur-gears 11 and 12 upon the shafts 3 3, the one 11 being of alarger pitch diameter than the other. Various equivalent modificationsin the gearing between the two shafts to attain a like result may beused without departing from the spirit of this part of my invention.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A crushing and grinding mill for ores,

&e., comprising, in combination, a pair of converging crushing-j aws 4,held together at their lower ends by guides or rollers 8, and theirupper ends attached to eccentric drivingshafts 3, that are gearedtogether so as to have a differential rotation, for the purpose setforth.

2. A crushing and grinding millfor ores, &c., comprising,in combination,a pair of converging crushing-j aws 4, held togetherat their lower endsby guides or rollers 8 and their upper ends attached to eccentricdrivingshafts 3, that are connected together by a pair of spur-gears 11,having different diameters, for the purpose set forth.

3. A crushing and grinding mill for ores, &c., comprising, incombination, a pair of converging erushing-jaws t, having the lowerportion of their face and back curved, as described, the rollers S forholding the lower ends of the jaws together, and the eccentricdriving-shafts 3, connected to and operating the upper ends of the jaws,for the purpose set forth.

at. A crushing and grinding mill for ores, &c., comprising, incombination, a pair of converging crushing-jaws 4, having the lowerportion of their face and back curved, as described, the rollers 8, madeadjustable to and from each other and adapted to hold the lower ends ofthe jaws together, and the eccentric drivingshafts 3, connected to andop erating the upper ends of the jaws, for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE S. KNAPI. Witnesses:

ROBERT Dorms, Geo. II. ARTHUR.

